Table 1: Characteristics of program stars.
Star V $T_{\rm eff}$, K $\log~g$ $V_{\rm t}$, km s-1 Rem
RX Vir 8.7-9.1 5950 4.00 1.5 SRd:
AB Leo 10.7-13.2 4130 0.00 2.4 SRd
CK Vir 10.2-11.0 4200 0.20 2.3 SRd
SV UMa 9.1-10.6 4300 0.00 2.4 SRd
TY Vir 8.0-8.5 4350 0.30 2.4 SRd
Classification of the stars is given following the GCVS. According to the ASAS database (http://www.astrouw.edu.pl/~gp/asas/asas.html) RX Vir seems to be a constant star.

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